A recent study conducted by researchers at the University of Portsmouth revealed that over 80 Percent of Tor network visits is related to pedo sites. The experts have discovered that the Tors most visited websites host child abuse images and offer illegal drugs. According to the study gambling websites, propaganda sites, bitcoin-related sites or anonymous whistle-blowing occupy a small part of the darknets investigated. The researchers counted nearly 45,000 hidden service and analyzed the amount or traffic flowed to them.”]
Source: https://securityaffairs.co/wordpress/31690/cyber-crime/pedo-websites-tor-network.html